Triple Play 2000 

Add one run to home team 
While playing a game, hold L + R + Z and press C-Left(2). -From: galexand@techisp.com

Add one run to away team 
While playing a game, hold L + R + Z and press C-Right(2). -From: galexand@techisp.com

Three ball count 
While playing a game, hold L + R + Z and press Up, Down.

Three outs 
While playing a game, hold L + R + Z and press Down, Up.

Hit a homerun 
While in the batter's box, hold L + R + Z and press Left, Up, Left, Up. -From: Metall8060@aol.com

Strike out the batter 
While on the pitching mound, hold L + R + Z and press Right, Up, Right, Up. -From: Metall8060@aol.com

Easy homeruns 
While in the batter's box, hold Analog-stick Up/Left and press B. If positioned correctly, the batter will hit a homerun most of the time.

Homerun sounds 
While running around the bases after hitting a homerun, press C-Up to hear a soft horn, C-Right to hear a loud horn, or C-Down to hear a whistle. -From: ChubbyBoy6@aol.com and StViper15